SOLUTION: in a class of 30 students, 7 have tape recorders, 15 have calculators, and 2 have both. how many of the 30 students have neither.

Algebra ->  Divisibility and Prime Numbers -> SOLUTION: in a class of 30 students, 7 have tape recorders, 15 have calculators, and 2 have both. how many of the 30 students have neither.      Log On


   

Question 938428: in a class of 30 students, 7 have tape recorders, 15 have calculators, and 2 have both. how many of the 30 students have neither.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
7 + 15 - 2 = 20, 30-20 = 10 have neither
0r one can think of it as:
(7-2) + (15-2) + 2 = 20